How to Show Indexes in Oracle Sql

How to show indexes in Oracle SQL

If you have the privileges, you can use the ALL_INDEXES or USER_INDEXES views. The query would be:

SELECT  *
FROM    all_indexes
WHERE   table_name = 'COUNTRY';

If you want some information on the columns included in the index, you can select those from ALL_IND_COLUMNS. Documentation regarding these views can be found here Static Data Dictionary Views: ALL_ALL_TABLES to ALL_MVIEWS

How do I get information about an index and table owner in Oracle?

According to the docs, you can just do:

select INDEX_NAME, TABLE_OWNER, TABLE_NAME, UNIQUENESS from USER_INDEXES

or

select INDEX_NAME, TABLE_OWNER, TABLE_NAME, UNIQUENESS from ALL_INDEXES

if you want all indexes...

How to see a list of all the indexes (including implicit ones) in SQL*Plus?

SELECT INDEX_NAME FROM ALL_INDEXES WHERE TABLE_NAME = 'your_table'

Note:
If you want to limit the search to a specific schema, you can also do:

SELECT INDEX_NAME FROM ALL_INDEXES WHERE TABLE_NAME = 'your_table' AND OWNER = 'your_owner'

This is useful in situations where you might have the same table name in multiple schemas.

Also, keep in mind that Oracle stores the table names as upper case, so in your example you need to do:

select * from all_indexes where table_name = 'TEMP';

Oracle - How to obtain information on index fields etc

How can I list indexes columns readily defined in Oracle

SELECT *
FROM all_ind_columns
WHERE table_name = 'YOUR_TABLE'

http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/statviews_1064.htm#i1577532

How do I use those indexes in a select statement

You don't have to do anything. If the index will speed up the query, Oracle will use it automatically.

Oracle:How to check index status?

EXPLAIN PLAN will show you what index is used and other information.

For example:

explain plan for
select * from tablename where createdate>=to_date('2016-02-29','yyyy-mm-dd');

select * from table(dbms_xplan.display);

Plan hash value: 3955337982

-------------------------------------------------------------------------------
| Id  | Operation         | Name      | Rows  | Bytes | Cost (%CPU)| Time     |
-------------------------------------------------------------------------------
|   0 | SELECT STATEMENT  |           |     1 |     9 |     2   (0)| 00:00:01 |
|*  1 |  TABLE ACCESS FULL| TABLENAME |     1 |     9 |     2   (0)| 00:00:01 |
-------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------

   1 - filter("CREATEDATE">=TO_DATE(' 2016-02-29 00:00:00', 
              'syyyy-mm-dd hh24:mi:ss'))

Note
-----
   - dynamic statistics used: dynamic sampling (level=2)

how to find all indexes and their columns for tables, views and synonyms in oracle

Your query should work for synonyms as well as the tables. However, you seem to expect indexes on views where there are not. Maybe is it materialized views ?

How can I see the contents of an Oracle index?

There's not a simple query - you can dump table or index blocks to trace files, but you have to identify the block you're interested in. Dion Cho has an example of how you can process this block dump with SQL, but it's not for the faint of heart.

However, you can do this:

select /* index_ffs (a [name of index]) */
       id, rowid 
  from a
 where id is not null
 order by id, rowid;

Oracle doesn't write index entries where all of the values being indexed are null, so if id is nullable, we need to filter those out. The index_ffs hint forces Oracle to satisfy the query reading the index blocks, not the data blocks. This "solution" doesn't show the data which would be in root or branch blocks, whereas a block dump can.

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